1. I'm guessing that the car was parked in such a way that the 'drivetrain' was in a bit of a bind. Either that, or, maybe you didn't have the clutch pedal all the way to the floor. A little 'crunch' now and then shouldn't do any real damage to the gearbox, but I wouldn't make a habit of it.
2. The wind blowing the door closed is also a pretty normal occurrence in most windy places. While I try never to slam the doors on my vehicles, they're designed to take fairly rough treatment. I watched my neighbor (who was having a first-class snit at the time) slam her door so hard that the glass shattered. The door worked just fine afterward, but she did have to pay the deductible for a new window!!
Hope this helps!
Dave B.